US2123120A

US2123120A - Turbo machine

Info

Publication number: US2123120A
Application number: US107471A
Authority: US
Inventors: Reiffenstein Manfred
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-10-26
Filing date: 1936-10-24
Publication date: 1938-07-05
Anticipated expiration: 1955-07-05

Description

H July 5, 1938. RE||=FENTE|N 2,123,120

TURBO MACHINE Filed 001;. 24, 1936 2 Sheets-Sheet 1 July 5, 1938. M. REIFFENSTEIN Filed Oct. 2.4, 1936 2 Sheets-Sheet 2 Patented July 5, 1938 U'NlTE'DSTAT ES PATENT OFFICE I 2,123,120 'ronno MACHINE Manfred Reiifenstein, Vienna, Austria Application October 24, 1936, Serial No. 107,471

In Austria October 26, 11935 6Claims.

ent invention by'giving to the water the possibility to form between the fixed devices which influence the stream line directions, thus between the guide vanes or the 'spur. or baflle, and the entrance-edges of the runner blades, a freely whirling body of water of such an extent, that it infiuences substantially the control characteristic of the turbine. l

The principle of the present invention is shown in Figs. 1 and 2 of the drawings. Figs. 3 to 10 illustrate diagrammatically and by way of ex-' ample four turbines constructed according to the present invention.

In Fig. 1, in the illustrated position of the runcomponent is reduced instantaneously to the,

smaller value 08. If care is taken, that a sufficiently large body of water, which is not impeded by any guiding device and may whirl free- 1y, is at disposal ahead of the runner, this said body of water will have the tendency to maintain the initial tangential velocity as owing to its considerable inertia. Therefore the initial tangential velocity on keeps invaried for some time, so that, as shown in Fig. 2, the efiective velocity of the water now changes to 01' and thus the relative velocity to w, the direction of which is adapted to the new position of the runner blade l, i. e. its direction is the same as that 01 the first element of the blade II. If the energy contained in the whirling body of water has been consumed also the tangential component Cu takes a smaller value cu" according to the employed type of turbine,

i. e. turbine with fixed guide vanes or without guide vanes. a a. at normal running of the turbine, the

(fill ESQ-Md) flow conditions substantially represent those of a turbine provided with fixed distributor just in front of the .runner, these conditions approach to those of a turbine with adjustable guide vanes during the period of regulation. Now it is well known that turbines with adjustable guide vanes possess a considerably better characteristic of regulation than turbines with fixed guide apparatus of common construction.

Asit will be readily seen, the period, during which the true characteristic of regulation of a turbine with adjustable guide vanes changes to that of a turbine with fixed guide apparatus, must be suificiently long, e. g. the infiuenceof the body of water, whirling ahead of the runner, which partly counteracts onto the entering water, must be sufiiciently large. As proven by numerous testings this eifect is obtained positively, when the cross-section'F of the whirling body of water,

measured in the plane through the turbine-axis and whirling between the tail edges of the guide vanes or the baflle-edgeof the spiral casing and the runners entrance, is so large, that it exceeds the value #10 11 whereby F designates the cross sectional area'of the passage expressed in square" feet, Q denotes the maximum discharge of the turbine expressed in cubic feet per second, 9 designates the acceleration of gravitation in feet per square second and H the head in feet.

In all constructions which 'now will be described, the reference character F designates a vertical cross sectional area taken at any .angle through the axis of the shaft.

Fig. 3 illustrates a constructional example of a turbine with fixed guide apparatus in section through the axis, the section being taken on line AB of Fig. 4. Fig. 4 is a vertical cross section through line D- E of Fig. 3. The guide vanes 2 are distanced from the runner blades l by the inner wall l and the outer wall 8 in such a manner, that the annular cross-section F formed by the inner edges of the guide vanes 2 and the entrance edges of the runner blades-l is greater than the value The draft tube 9 surrounds the runner and serves for discharging the water.

In this case the necessary value of the crosssection F has been obtained essentially by making the guide vanes Z sumciently high.

but with spiral casing in section through the axis the section being taken on line G-H of Fig. 8.

Fig. 8 is a. vertical cross section through the axis of the shaft of the turbine shown in Fig. 7. In this case, the cross-section F of the freely whirling body of water is bounded by the battle-edge 3 ofthe spiral casing 6, by the inner wall I, the outer wall 8, and the runner's entrance edge, so that the cross-sectional area F is to be measured between this bafile-edge 3 and the entrance edge of the runner I. Figs. 9 and 10 illustrate a turbine of modified construction in section through the axis, the section of Fig. 9 being taken on line J-K of Fig. 10, while Fig. 1 is a vertical cross section through the axis of the shaft of the turbine shown in Fig. 9. In this construction, fixed splitters 4 are arranged in the entrance, the tailedge 5' of said splitters being disposed nearer to the shaft of the turbine than the baffle-edge 3, the cross-sectional area F has to be measured between the said tail-edge 5 and the entrance edge of the runner I.

The present invention is applicable also to turbo-pumps whereby Q designates the maximum delivery and H the head.

What I claim is:-

1. In a turbo-machine, a distributor with fixed guide vanes, a shaft centrally disposed in said distributor, a runner provided with adustable runner-blades and secured to said shaft, a draft tube for discharging the water from the runner,

an inner wall establishing communication between said guide vanes and said runner, and an outer wall establishing communication between said guide vanes and said draft tube, whereby the free vertical cross-sectional area between the tail-edges of said guide vanes, the runners entrance edges and said inner and outer wallsexceeds the value I and is measured in a plane through said shaft.

2. In a turbo-machine, a cylindrical distributor with fixed guide vanes, a shaft centrally disposed and is measured in a plane through said shaft.

3. In a turbo-machine, a conical distributor with fixed guide vanes, a shaft centrally disposed in said distributor, a runner provided with adjustable runner-blades and secured to said shaft, a draft tube for discharging the water from the runner, an inner wall establishing communication between said guide vanes and said runner, and an outer wall establishing communication between said guide vanes and said draft tube, whereby the free vertical cross-sectional area between the tail-edges of said guide vanes, the runners entrance edges and said inner and outer walls exceeds the value 4m and is measured in a plane through said shaft.

4. In a turbo-machine, an axial distributor with fixed guide vanes, a shaft centrally disposed in said distributor, a runner provided with adjustable runner-blades and secured to said shaft, a draft tube for discharging the water from the runner, an inner wall establishing communication between said guide vanes and said runner, and an outer wall establishing communication between said guide vanes and said draft tube, whereby the free vertical cross-sectional area between the tail-edges of said guide vanes, the runner's entrance edges and said inner and outer walls exceeds the value and is measured in a plane through said shaft.

5. In a turbo-machine, a plain spiral casing, a

shaft centrally disposed in said casing, a runner provided with adjustable runner-blades and secured to said shaft, a draft tube for discharging the water from the runner, an inner wall establishing communication between said casing and said runner, and an outer wall establishing communication between said casing and said draft tube, whereby the free vertical cross-sectional area between the edge of the baflle of said casing, the runners entrance edges and said inner and outer walls exceeds the value Q /10.g.H

and is measured in a plane through said shaft.

6. In a turbo-machine, a plain spiral casing, a splitter in the entrance of said casing, a shaft centrally disposed in said casing, a runner provided with adjustable runner-blades and secured to said shaft, a draft tube for discharging the water from the runner, an inner wall establishing communication between said casing and said runner, and an outer wall establishing communication between said casing and said draft tube, whereby the free vertical cross-sectional area between the tail-edge of said splitter, the runner's entrance edges and said inner and outer walls exceeds the value and is measured in a plane through said shaft.

MANFRED REIFFENSTEIN.